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4fa26a6079
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Roger Sayle 4fa26a6079 flags.h (flag_wrapv): New flag controlling overflow semantics. 
* flags.h (flag_wrapv): New flag controlling overflow semantics.
	* toplev.c (flag_wrapv): Declare the variable with default false.
	(lang_independent_options): New option "-fwrapv" to set the above.

	* fold-const.c (extract_muldiv_1): Disable optimization of (2*x)/2
	as x, when signed arithmetic overflow wraps around.
	(fold): Optimize "-A - B" as "-B - A" if overflow wraps around.
	* loop.c (basic_induction_var): Ignore BIVs that rely on undefined
	overflow when flag_wrapv is true.

	* java/lang.c (java_init_options): Prescribe wrap-around two's
	complement arithmetic overflow by setting flag_wrapv.

	* doc/invoke.texi: Document new -fwrapv command line option.
	* doc/c-tree.texi: Mention that the overflow semantics of
	NEGATE_EXPR, PLUS_EXPR, MINUS_EXPR and MULT_EXPR is dependent
	upon both flag_wrapv and flag_trapv.

	* gcc.dg/fwrapv-1.c: New test case.
	* gcc.dg/fwrapv-2.c: New test case.

	* libjava.lang/Overflow.java: New test.
	* libjava.lang/Overflow.out: New file.

From-SVN: r67270
2003-05-31 13:23:32 +00:00
boehm-gc configure.in: define GC_DLL under mingw if --enable-shared 2003-04-28 20:54:37 +00:00
config * acinclude.m4: Accept i[3456789]86 for machine type. 2003-05-19 14:09:59 -04:00
contrib analyze_brprob, [...]: Change GNU CC to GCC. 2003-05-23 16:20:44 +00:00
fastjar fastjar.texi: Remove @ at start of file. 2003-03-30 17:56:33 +01:00
gcc flags.h (flag_wrapv): New flag controlling overflow semantics. 2003-05-31 13:23:32 +00:00
include hex.c (_hex_value): Make this unsigned. 2003-05-15 19:02:13 +00:00
INSTALL
libf2c configure.in (_XOPEN_SOURCE): Bump to 600. 2003-04-21 13:37:48 +00:00
libffi configure.in (HAVE_RO_EH_FRAME): Check whether .eh_frame section should be read-only. 2003-05-17 00:09:22 +02:00
libiberty * config.table: Accept i[345867]86 variant. 2003-05-19 22:49:26 -04:00
libjava flags.h (flag_wrapv): New flag controlling overflow semantics. 2003-05-31 13:23:32 +00:00
libobjc hash.c, [...]: Replace "GNU CC" with "GCC". 2003-05-23 20:25:39 +00:00
libstdc++-v3 Daily bump. 2003-05-31 00:16:06 +00:00
maintainer-scripts snapshot-index.html: Refer to .bz2 files instead of .gz files. 2003-05-28 15:14:37 +00:00
zlib libtool.m4 (lt_cv_deplibs_check_method): Use pass_all on mips*. 2003-04-11 04:20:21 +00:00
.cvsignore
ChangeLog Remove myself as m32r/v850 maintainer 2003-05-29 00:22:36 +00:00
config-ml.in config-ml.in: Propagate INSTALL variables. 2003-05-06 20:58:44 +00:00
config.guess config.guess: Update to 2003-05-09 version. 2003-05-13 14:08:22 +02:00
config.if config.if: If gcc_version is already set, just use it. 2003-01-30 11:52:51 +00:00
config.sub config.guess: Update to 2003-05-09 version. 2003-05-13 14:08:22 +02:00
configure configure.in: Use curly braces in the definition of tooldir. 2003-05-21 22:49:07 -04:00
configure.in configure.in: Use curly braces in the definition of tooldir. 2003-05-21 22:49:07 -04:00
COPYING
COPYING.LIB
install-sh
libtool.m4 libtool.m4 (lt_cv_deplibs_check_method): Use pass_all on mips*. 2003-04-11 04:20:21 +00:00
ltcf-c.sh Merge basic-improvements-branch to trunk 2002-12-16 18:23:00 +00:00
ltcf-cxx.sh libtool.m4 (LD): Append -melf* option to LD on IRIX with GNU ld. 2003-02-20 01:11:51 +00:00
ltcf-gcj.sh ltcf-cxx.sh: Replace $linker_flags with $compiler_flags wherever it is used as argument to $CC. 2003-02-19 23:50:23 +00:00
ltconfig libtool.m4 (LD): Append -melf* option to LD on IRIX with GNU ld. 2003-02-20 02:09:45 +00:00
ltmain.sh
MAINTAINERS Remove myself as m32r/v850 maintainer 2003-05-29 00:22:36 +00:00
Makefile.def Makefile.def: Remove "snavigator", "grep", and "db" modules. 2003-02-06 15:55:11 -05:00
Makefile.in Makefile.tpl: Make maybe-check-gcc .PHONY. 2003-05-28 15:15:38 -04:00
Makefile.tpl Makefile.tpl: Make maybe-check-gcc .PHONY. 2003-05-28 15:15:38 -04:00
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README 

This directory contains the GNU Compiler Collection (GCC).

The GNU Compiler Collection is free software.  See the file COPYING
for copying permission.  The manuals, and some of the runtime
libraries, are under different terms; see the individual source files
for details.

The directory INSTALL contains copies of the installation information
as HTML and plain text.  The source of this information is
gcc/doc/install.texi.  The installation information includes details
of what is included in the GCC sources and what files GCC installs.

See the file gcc/doc/gcc.texi (together with other files that it
includes) for usage and porting information.  An online readable
version of the manual is in the files gcc/doc/gcc.info*.

See http://gcc.gnu.org/bugs.html for how to report bugs usefully.